Supreme Court Justice Elizabeth Hollingworth said it was clear Lindemann was motivated by rage, jealousy and a sense of entitlement.

"This was not a momentary loss of self-control," she said.

"You were clearly determined to kill Ms Lezsak."

Ms Lezsak's young daughter, known in court under the pseudonym Lily, heard yelling from a bedroom ensuite on the morning of May 30 and ran to see her mother being attacked.

Lindemann stabbed his partner, strangled her and dragged her through the house.

Lily tried to stop Lindemann, kicking him and twice pulling the knife out of his hands, but he kept grabbing more weapons.

He used six knives in total, breaking two of them, as he inflicted the fatal stab wounds to Ms Lezsak's head, neck and chest.

Lily also suffered five wounds during the attack. 

Lindemann left Ms Lezsak on the kitchen floor and went to the bedroom where he made a $70,000 bank transaction and tried to call his ex-wife.

Meanwhile, a distressed Lily called triple zero while cradling her bleeding mother, telling the operator there was a murderer in the house.

Police and paramedics arrived but Ms Lezsak could not be revived.

Lindemann was found in his bedroom with a self-inflicted stab wound to his chest, telling officers he didn't want to be saved and Ms Lezsak had ruined his life.

Justice Hollingworth said his actions after the murder were "particularly calculated".

"It demonstrates a concern for the financial position of yourself or your children, rather than the welfare of Ms Lezsak, Lily or their family members," she said.

The justice almost almost broke down as she spoke of Lily's actions, telling Lindemann he was lucky he didn't injure the young girl more seriously.

"What she did to try and save her mother was unbelievably brave," Justice Hollingworth said.

"Hopefully, as she grows up, Lily will come to understand that there was nothing more that she could have done to save her mother."

The judge said the murder of a domestic partner was an extreme form of family violence, and Lindemann's offending was aggravated by the fact that Lily, her twin brother and Ms Lezsak's mother were all present.

She found Lindemann had no genuine remorse for his actions and he continued to blame Ms Lezsak, instead of taking responsibility.

But the judge accepted Lindemann entered a guilty plea at a very early stage and his prospects of rehabilitation would improve over the course of his sentence.

She jailed him for 31 years but he will be eligible for parole after serving 25.

Lindemann remained emotionless as his sentence was handed down and he was led out of the courtroom.

Ms Lezsak's longtime friend, Jacqueline Schwarcz, said her supporters were relieved Justice Hollingworth "threw the book" at Lindemann.

"But there is no amount of punishment that will be enough or replace our loss," she told reporters outside court.

"The destruction that has ensued and devastation it has caused is unfixable."

Ms Schwarcz said Ms Lezsak's family and friends would continue to support her two young children.

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